Which solution is made from a collection of secure development practices and guidelines that developers must follow to build secure applications?

AFL (American Fuzzy Lop) is a specific fuzzer, a tool for finding software bugs by brute-force testing, not a collection of secure development practices.

A Fuzzing Framework is a category of tools used for discovering vulnerabilities by providing malformed inputs, not a collection of general secure development practices.

Radamsa is a specific fuzzer, similar to AFL, designed for generating test cases for robustness testing, not a comprehensive set of secure development guidelines.

OWASP (Open Web Application Security Project) is a widely recognized non-profit organization that offers a vast collection of freely available resources, including secure development practices, guidelines, tools, and methodologies, which developers use to build and maintain secure applications.